Pyrographic-pencil exciter.



PATENTED DEC. 6, 1904.

J. ANDERSON. PYROGRAPHIG PENCIL EXUITER.

APPLICATION FILED 00117. 1903.

N0 MODEL.

NITED STATES Patented December 6, 1904.

JOI-IANNES ANDERSON, OF CHICAGO, ILLINOIS.

PYROGRAPHlC-PENOIL EXCITER.

SPECIFICATION forming part of Letters Patent No. 776,4.82, datedDecember 6, 1904.

Application filed October 17, 1903. Serial No. 177.397. (N0 model.)

To all whom it may concern:

Be it known that I, JoHANNEs ANDERSON, a citizen of the United States,residing at Chicago, in the county of Cook and State. of Illinois, haveinvented new and useful Improvements in Pyrographic Pencil Exciters, ofwhich the following is a specification, referencebeinghadtotheaccompanyingdrawings,forming a part thereof.

This invention relates to apparatus for exciting a pyrographic pencil totemperature necessary for its work and controlling the excitation of thesame for uniformity or variation of the temperature.

It consists in the features of construction set out in the claims.

In the drawings, Figure 1 is a perspective view of a familiar form ofpyrographic pencil with devices in connection for exciting the sameembodying my invention. Fig. 2 is a vertical section of the receptaclefor the excited fluid and the devices therein containing my invention.Fig. 3 is a section at the line 3 3 on Fig. 2. Fig. 4 is a section atthe line 4 i on Fig. 2.

The pyrographic pencil 1 is of familiar construction. having itsplatinum terminal 2 excited for maintenance of the temperature by vaporgenerated from the liquid in the receptacle 3 and forced through thepencil by the pumping apparatus, represented by the elastic bulb 4 andpressure-retaining bulb 5. A defect has been found in the use of similarapparatus heretofore, arising from the fact that the liquid, usuallybenzin or gasolene, employed for generating the excitant vapor after ashort use of the apparatus becomes in the condition technically calleddead -that is, a condition in which vaporization occurs very slowly, sothat it is not furnished to the pencil in suflicient quantity toadequately excite the platinum terminal for maintenance of a workingtemperature, or if a temperature suiiicient for fine lines is produced atemperature adequate for broad and heavy and varied work cannot bemaintained.

My improvement consists in the structure of the vaporizer, whichcomprises the receptacle 3, having a stopper 6, provided with twovertical passages 7 and 8, which at their lower end open in thereceptacle and extend upward in the stopper for connection at theirupper ends with outleading passages 9 and 10, these latter beingconnected, respectively, by a duct 11 with the air-pressure bulb 5 andthe duct 12 with the pencil 1. My improvement consists in extending fromthe lower end of the duct 7 a tube 13 down to the bottom of thereceptacle 3, where it opens for discharge below the surface of theliquid therein, being preferably provided with a finely-perforateddischarge-head 14: for discharge of the air in fine jets in severaldirections in the liquid. A long tapered or needle valve 15 is setthrough the top of the stopper to control the inlet for air into thepassage 7, and thereby control the discharge of air through the head 14With this construction the air instead of being compressed upon the topof the liquid with a tendency to deaden the same, restraining anddiminishing its tendency to vaporize, is discharged in the liquid andpassing up-through it for emergence above the liquid keeps the liquid ineffervescence, and the air is itself thoroughly charged with the vaporas it breaks from the surface of the liquid, and the liquid itself ismore or less sprayed into the air above the surface of the receptacle,so that vaporization is promoted instead of being restrained bycontinued use, and the longer it is used the more rapidly is the vaporformed up to a certain limit. The result of the change of the structureis that the pencil-point 2, having once been heated to proper point forfurther excitation by the catalytic action of the vapor upon theplatinum, according to a well-known principle, is easily maintained atany temperature, oven to whiteness, if desired, and even when it hasbeen allowed to cool to I a point even below redness it can be reexcitedto redness and incandescence by the exciter having my improvementsdescribed.

The tendency to increase the rate of vaporization by continued use bythis device on account of the increased aeration of the liquid makes itnecessary to regulate the discharge of air to prevent the excitation ofthe pencil from becoming excessive, and for this purpose the valve 15 isan important and practicallya necessary addition to accompany theaddition of the duct 18 for discharging the air within instead of uponthe liquid. If the artist is executing work which requires intensepyrographic effect, so that he desires to use the pencil broadside forheavy shadings or edgewise with pressure for indentations or carvingeffects and for such purposes needs to keep the working point 2 at hightemperature,the valve may be set so as to permit this result; but whenworking for light effects the valve may be adjusted so as to restrictthe discharge of air to the quantity which. according to the conditionof the liquid will yield the right temperature. The different degrees ofvolatility of different lots or quantities of the liquid, whether it bebenzin, gasolene, or other volatile hydrocarbon, will necessitatedifferent adjustment of the valve to yield the same excitant effect.

I claiin l. A pyrographic-pencil exciter comprising a receptacle for theliquid to afiord the excitant vapor; a removable stopper for suchreceptacle having two non-communicating passages from the inner to theouter end thereof; a tube connected to one of said passages andextending down toward the bottom of the receptacle and provided at thelower end with a finely-perforated distributing-head; a valve in thestopper controlling said duct, the other duct having its opening at theinner end of the stopper for receiving vapor from the upper part of thereceptacle, and having its exterior end provided with connections forthe pencil.

2. A pyrographic-pencil exciter comprising a receptacle for the liquidto afford the excitant vapor; a removable stopper having an airinletpassage and a gas-outlet passage, both extending from the lower end ofthe stopper upward therein to a point above the top of the receptacle,said stopper having outwardly-extending passages connecting with theupper ends of said inlet and outlet passages respectively, and inlet andoutlet pipes connected to said outwardly-extending passagesrespectively, the air-inlet passage having atits lower end a ductextending downward within the receptacle and terminating for dischargenear the bottom thereof; a taper-pointed valve set through the top ofthe stopper and entering end wise the upper end of one of saidupwardlyextending passages and adapted to be screwed up and down in thestopper to regulate the flow of fluid through said passage.

3. A 'pyrographic-pencil exciter comprising a receptacle for the liquidto afford the excitant vapor; a removable stopper having an airinlet anda gas-outlet passage, both extending from the lower end of the stopperupward therein to a point above the top of the receptacle, said stopperhaving outwardly-extending passages connecting with the upper ends ofsaid inlet and outlet passages respectively, and inlet and outlet pipesconnected to said outwardlyextending passages respectively, theair-inlet passage having at its lower end a duct extending downwardwithin the receptacle and terminating for discharge near the bottomthereof; a taper-pointed valve set through the top of said stopperacross the outwardlyextending passage which connects with the air-inletpassage and into the upper end of said air-inlet passage for regulatingthe inflow of air for discharge into the liquid in the receptacle.

4. Apyrographic-pencil exciter comprising a receptacle for the liquid toafford the excitant vapor; a removable stopper for such receptaclehaving two non-communicating passages extending from the inner endthereof upward to a point above the top of the receptacle;non-communicating chambers in the stopper into which said passagesrespectively lead; inlet and outlet pipes connected to said chambersrespectively, and a taper-pointed valve set into the stopper across oneof said chambers and taking into the end of the passage leadingthereinto for regulating the flow of fluid.

5. A pyrographic-pencil exciter comprising a receptacle for the liquidto afford the excitant vapor; a removable stopper having an inlet and adischarge passage, both extending from the lower end of the stopperupward therein to a point above the top of the receptacle; one of saidpassages extending thence at an angle to the upwardly-extending part; ataper-pointed valve set into the stopper across one part of saidlast-mentioned passage and entering end wise into the other part andadapted to be screwed in and out to regulate the flow of fluid throughsaid passage; the inletpassage having at its lower end a duct extendingdownward within the receptacle and terminating for discharge near thebottom thereof, both said passages being extended to the outer exposedsurface of thestopper and being provided with inlet and outlet pipesconnected to them respectively at their outer ends.

6. A pyrographic-pencil exciter comprising a chamber for containingliquid, said chamber having an air-inlet and a gas-outlet passage, thelatter terminating near the upper part for intake, and the formerterminating near the lower part for discharge, one of said passagesbeing turned at an angle, and a taper-pointed valve which crosses one ofthe parts at such angle and enters endwise into the other part, adaptedto be screwed in and out to regulate the flow of fluid.

7. A pyrographic-pencil exciter comprising a chamber for containingliquid, said chamber having an air-inlet passage and a gas-dischargepassage, the latter opening for intake at the upper part, and the formeropening for discharge at the lower part, the inlet-passage being turnedat an angle; a taper-pointed valve I my hand, in the presence of tWowitnesses, at extending across one part of the passage at l Chicago,Illinois, this 9th day of October, the angle and entering endwise intothe other 1903.

part, and adapted to be screwed in and out to J OHANN ES ANDERSON. 5regulate the flow of fluid through such angu- In presence of* 12,1-passage. CHAS. S. BURTON,

In testimony whereof I have hereunto set FREDK. G. FISCHER.

